Pulley support for crown blocks



Feb. 16,1926.

' L. E. ZERBE PLLE SUPPORT FOR CROWN BLOCKS Filed May 19, 1925 Patented Fee. 16, 1926.

UNITED STATES PATENT VoFFIcE.

LnwIs n. Zaman, or MONETA, CALIFORNIA, AssIGNoB. To UNION 'rooL` coIIPANY, or

ToImANoE, CALIFORNIA, A conroaATIoN or CALIFORNIA.

PULLEY SUPPORT FR CROWN' BLCKS.

Appucation falealivray 1e, 1925. serial No. 31.347.

T all whom t may concern.' A Be it known that I, LEWIS E. Zinnen, a

' citizen of the United States, residing at Moneta, in the county of Los Angeles and "State of California, have invented a new and useful Pulley Support for- Crown Blocks, `of which the following is aspecifil.

cation.

This invention relates to pulley support4 of the character employed in crown blocks for drilling oil wells, and an object of the invention is to provide a construction that will avoid weakening the shaft.

The prior practice has been to flatten the shaft on its .underside at its opposite ends and theseflattened faces rest directly upon beams of the crown block. This cutting of the shaft in this manner weakens it and I avoid this by resting the shaft on bearings and providing a'cap with an internal shoul-` der adapted to seat upon the attened face of recesses cut in the upper side of the shaft at the ends thereof.

A further object is to rovide a construction that will permit o thebearing block being made relatively short. This is important, especially when extremely large -pulleys are employed-in the crown block,

since the shorter the pulley sup orts are the closer together may pulleys o a given diameter be adjusted.

The accompanying drawings `illustrate the invention:

Fig. 1 is an elevation, partly in section, of a pulley support embodying the invention, a pulley and ,a pair of beams of the crown block also being shown in section.

Fig. 2 is a sectional -elevation on the line indicated by 2 2, Fig. 1.

Fig. 3 is a sectional elevation on the line indicated by 3-3, Fig. 2.

There is provided a shaft 6 on `which is rotatably mounted a pulley a which does not constitutea portion of the presentinvention. The shaft 6 is provided with recesses 7 in its upper face at its opposite ends and the end portions of said shaft rest in concave seats 8 formed in a bearing 9. The bearings 9 are adapted to rest upon the upper face of the upper flanges of I-beams b of the crown block and each bearing 9 is provided with four vertical bolt holes 10.

vided with bolt holes 14 which register with the bolt holes 10. Through the bolt holes 14, that are nearest the outer ends of the suport, pass bolts 15 and through the bolt oles l0, 14, that are near the innerends of the members 9, 13, extend bolts 16; The bolts 15 are straight with the exception of being provided lat their lower ends with laterally eitending shoulders 17 to engage beneath the upper flanges of the I-beams ZJ. The bolts 16 have arched portions near their lower ends 18. The lower ends of the bolts 16 have shoulders 19 that engage beneath the upper anges of the I-beams.

The upper faces of the side walls 20 of each of the bearings 9 are substantially iiush with the recess faces 11, and the end wall 21 of each bearing extends up past the adjacent outer end of the shaft to cover the same.

By the foregoing described construction the bearing block for the shaft may be made relatively short and the pulley hub relativel long yas the bolts 16 will not interfere with the hub of the pulley. This is an advantage when using extremely large pulleys in the crown block as the shorter the bearing blocks are the closer together may pulleys of a given diameter be adjusted on the crown block.

From the foregoing it will 'be seen that the bearings 9 and caps 13 can be shifted to any desired position along the I-beams and then secured in such position by tightening the bolts 15, 16, thus making it convenient for positioning the pulley a in relation tothe other pulleys of the crown block.

In order to provide the pulley a with a lubricant, the shaft 6 is provided with aduct 23 which opens to the iiat bottom face 11 of one of the recesses and which communicates with a filling nipple 24l that projects through the hole 22 in one of the caps 13.

The foregoing will make clear the construction and operation of the invention, for it is well known in this art that the casing line is placed on the pulley a to effectY lowering Iand elevating of the well casing.

In'the instance shown in the drawings I provide safety collars 25 on the bolts 15, 16 in the form of circular nuts screwed down upon the upper faces of the bearing blocks 9, as disclosed in my prior Patent No. 1,506,105, granted August 26, 1921.

, I Claim:

l. A pulley sup ort for a crown block,

`comprising a shaft aving recesses in the upper side at its opposite ends, bearings having concave seats forthe shaft to rest in and having bolt holes, caps provided with internal shoulders engaging in the recesses, said caps having bolt holes registering with the first mentionedbolt holes and bolts extending through the bolt holes and having shoulders to engage beneath the flanges of I-beams on which the bearings rest.

" 2. A pulley support for a crown block, comprising a shaft having recesses in its upper side at its opposite ends, bearings having concave seats for the shaft to rest in and having bolt holes, the outer end Walls of the bearings extending up past the outer ends of the shaft, and caps provided with internal shoulders engaging in the recesses, said caps.

havingvbolt holes registeringowith the rst mentioned bolt holes, and lts extending through the bolt holes and having shoulders to engage beneath the flanges of I-beams on.

internal shoulders engaging in the recesses,

said caps having bolt holes registering with the first mentioned bolt holes, and bolts having straight portions extending through the bolt holes and having shoulders to engage Ibeneath the fianges of I-beams on which the bearing blocks rest, some of said bolts having arched portions near their lower ends to extend around the inner edges of the-upper flanges of the I-beams to oau the straight portions of said bolts to lie above the I- beams.

Signed at Torrance, California, this 11th day of May, 1925.

p LEWIS E. zEaBn. 

